Having established that a convicted murderer in a U.S. prison is the country's most prolific serial killer, U.S. law enforcement is now trying to identify additional victims.

It is five years since FBI analysts began linking cases to Samuel Little, and nearly 18 months since a Texas Ranger began to elicit from him a breathtaking number of confessions.

Little has confessed to an astonishing 93 murders over nineteen U.S. states, and FBI crime analysts believe all of his confessions are credible. Law enforcement has been able to verify fifty of the confessions so far, and are still working on the others.

According to Wikipedia, in 1961 Little was sentenced to three years in prison for breaking into a furniture store in Lorain; he was released in 1964. By 1975, he had been arrested 26 times in eleven states for crimes including theft, assault, attempted rape, fraud and attacks on government officials.

In 1982, Little was arrested in Paccagiula, Mississippi, and charged with the murder of a 22-year-old woman named Melinda LaPree, who had gone missing in September of that year. A grand jury declined to indict Little for the murder of LaPree. However, while under investigation, Little was transferred to Florida to be brought to trial for the murder of 26-year-old Patricia Mount, whose body was found in September 1982. Prosecution witnesses identified Little in court as a person who spent time with Mount on the night before her disappearance. Due to mistrust of witness testimonies, Little was acquitted in January 1984.

Little moved to California, where he stayed in the vicinity of San Diego. In October 1984, he was arrested for kidnapping, beating and strangling Laurie Barros, 22 years old, who survived. One month later, he was found by police in the backseat of his car with an unconscious woman, also beaten and strangled, in the same location as the attempted murder of Barros. Little served 212 years in prison for both crimes. Upon his release in February 1987, he immediately moved to Los Angeles and committed more than ten additional murders.

Little was arrested on September 5, 2012, at a homeless shelter in Louisville, Kentucky, after authorities used DNA testing to establish that he was involved in the murder of Carol Elford, killed on July 13, 1987; Guadalupe Apodaca, killed on September 3, 1987; and Audrey Nelson, killed on August 14, 1989. All three women were killed and later found on the streets of Los Angeles. He was extradited to Los Angeles, where he was charged on January 7, 2013. A few months later, police said Little was being investigated for involvement in dozens of murders committed in the 1980s, which until then had been undisclosed. In connection with the new circumstances in Mississippi, the LaPree murder case was reopened.

Little says he strangled his 93 victims between 1970 and 2005. Many of his victims' deaths, however, were originally ruled overdoses or attributed to accidental or undetermined causes. Some bodies were never found.

"For many years, Samuel Little believed he would not be caught because he thought no one was accounting for his victims," ViCAP Crime Analyst Christie Palazzolo said earlier this month. "Even though he is already in prison, the FBI believes it is important to seek justice for each victim, to close every case possible."

The FBI is asking for the public's help in matching the remaining unconfirmed confessions. The FBI's Violent Criminal Apprehension Program (ViCAP), with the support of the Texas Rangers, has provided additional information and details about three cases in the hope that someone may remember a detail that could further the investigation.

If you have any information linked to Little's confessions, please contact the FBI at 1-800-CALL-FBI or submit a tip online at tips.fbi.gov.

Note: Samuel Little's recollection of dates is not always accurate. He also sometimes struggles to remember the exact clothing worn by a victim. Any potential links should not be dismissed based on these two factors alone. The videos of Little contain references to violent acts. Viewer discretion is encouraged. Each video is accompanied by Little's drawing of the victim.

Unmatched Confession: Miami, Florida, 1971 or 1972

Little recounted that in 1971 or 1972 he met an attractive 18- to 19-year-old transgender woman in Miami, Florida. Little recalled her name was Marianne or Mary Ann. Little said Marianne was between 5'6" - 5'7" tall and approximately 140 pounds. Little first met Marianne at a bar known as The Pool or Pool Palace near 17th Avenue in Miami. A few days later, they met again at a bar in Overtown, where Little offered to give her a ride home. Little stated Marianne lived with several other roommates between Brownsville and Liberty City. When they arrived there, one of Marianne's roommates asked them to buy a can of shaving cream, so they returned to Little's car-a gold 4-door Pontiac LeMans. Little drove Marianne north on Highway 27 and killed her on a driveway, possibly near a sugarcane field. He then drove further down Highway 27, into the Everglades, and turned down a dirt road that led to a river or a swamp. Little dragged Marianne's body approximately 200 yards into the thick, muddy water. He does not believe the body was ever found.

Unmatched Confession: Miami, Florida, 1971 or 1972

Little recounted that in 1971 or 1972 he met an attractive 18- to 19-year-old transgender woman in Miami, Florida. Little recalled her name was Marianne or Mary Ann. Little said Marianne was between 5'6" - 5'7" tall and approximately 140 pounds. Little first met Marianne at a bar known as The Pool or Pool Palace near 17th Avenue in Miami. A few days later, they met again at a bar in Overtown, where Little offered to give her a ride home. Little stated Marianne lived with several other roommates between Brownsville and Liberty City. When they arrived there, one of Marianne's roommates asked them to buy a can of shaving cream, so they returned to Little's car-a gold 4-door Pontiac LeMans. Little drove Marianne north on Highway 27 and killed her on a driveway, possibly near a sugarcane field. He then drove further down Highway 27, into the Everglades, and turned down a dirt road that led to a river or a swamp. Little dragged Marianne's body approximately 200 yards into the thick, muddy water. He does not believe the body was ever found.

Unmatched Confession: Covington, Kentucky, 1984

Little stated that in approximately 1984, possibly in the summertime, he was driving his Lincoln Continental Mark III from Loraine, Ohio, to Cincinnati. While en route, he met a 25-year-old white female outside a strip club. He remembers her as being 5'6" - 5'7" tall and 130-170 pounds. Little describes her as having short blonde hair and blue eyes with a "hippie" appearance. She approached him and asked for a ride to Miami, Florida, saying her mother lived there. Little said he and the woman drove south on Interstate 75. When they reached Cincinnati, the two of them spent time downtown on Vine Street. They continued driving together, across the river into northern Kentucky. Little described driving to a hilly area not far from I-75. He drove up a small dirt road to the top of a "little round hill," where he strangled the woman in the backseat of his car. He left her body on the top of the hill.